/**
 * Copyright (C) 2009 eXo Platform SAS.
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.commons.utils;

import junit.framework.AssertionFailedError;
import org.exoplatform.component.test.AbstractGateInTest;

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public class TestSafe extends AbstractGateInTest
{

   public TestSafe()
   {
   }

   public TestSafe(String s)
   {
      super(s);
   }

   public void testClose()
   {
      assertFalse(Safe.close(null));
      assertTrue(Safe.close(new ByteArrayOutputStream()));
      assertFalse(Safe.close(new Closeable()
      {
         public void close() throws IOException
         {
            throw new IOException();
         }
      }));
      assertFalse(Safe.close(new Closeable()
      {
         public void close() throws IOException
         {
            throw new RuntimeException();
         }
      }));
      final Error expectedError = new Error();
      try
      {
         Safe.close(new Closeable()
         {
            public void close() throws IOException
            {
               throw expectedError;
            }
         });
         fail();
      }
      catch (Error error)
      {
         assertSame(expectedError, error);
      }
   }

   private static class Thrower
   {

      private final Throwable t;

      private Thrower(Throwable t)
      {
         this.t = t;
      }

      @Override
      public boolean equals(Object obj)
      {
         if (t instanceof Error)
         {
            throw ((Error)t);
         }
         if (t instanceof RuntimeException)
         {
            throw ((RuntimeException)t);
         }
         throw new AssertionFailedError();
      }
   }

   public void testEquals()
   {
      Object o = new Object();
      assertTrue(Safe.equals(o, o));
      assertTrue(Safe.equals(null, null));
      assertFalse(Safe.equals(new Object(), null));
      assertFalse(Safe.equals(null, new Object()));
      assertFalse(Safe.equals(new Object(), new Object()));
      assertFalse(Safe.equals(new Thrower(new RuntimeException()), null));
      assertFalse(Safe.equals(null, new Thrower(new RuntimeException())));
      assertFalse(Safe.equals(new Object(), new Thrower(new RuntimeException())));
      assertFalse(Safe.equals(new Thrower(new Error()), null));
      assertFalse(Safe.equals(null, new Thrower(new Error())));
      assertFalse(Safe.equals(new Object(), new Thrower(new Error())));
      RuntimeException re = new RuntimeException();
      Error er = new Error();
      try
      {
         Safe.equals(new Thrower(er), new Object());
         fail();
      }
      catch (Error e)
      {
         assertSame(er, e);
      }
      try
      {
         Safe.equals(new Thrower(re), new Object());
         fail();
      }
      catch (RuntimeException e)
      {
         assertSame(re, e);
      }
   }

   public void testSetUnmodifiable()
   {
      assertNull(Safe.unmodifiableSet(null));
      Set<String> strings = new HashSet<String>();
      strings.add("a");
      strings = Safe.unmodifiableSet(strings);
      try
      {
         strings.add("b");
         fail();
      }
      catch (Exception e)
      {
      }
      assertEquals(Collections.singleton("a"), strings);
   }

}
